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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * | |
3 | * Procedures for interfacing to the RTAS on CHRP machines. | |
4 | * | |
5 | * Peter Bergner, IBM March 2001. | |
6 | * Copyright (C) 2001 IBM. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <stdarg.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
8f5c7579 NL |
22 | #include <linux/smp.h> |
23 | #include <linux/completion.h> | |
24 | #include <linux/cpumask.h> | |
d9b2b2a2 | 25 | #include <linux/lmb.h> |
1da177e4 LT |
26 | |
27 | #include <asm/prom.h> | |
28 | #include <asm/rtas.h> | |
31a7f67e | 29 | #include <asm/hvcall.h> |
1da177e4 | 30 | #include <asm/machdep.h> |
e8222502 | 31 | #include <asm/firmware.h> |
1da177e4 LT |
32 | #include <asm/page.h> |
33 | #include <asm/param.h> | |
34 | #include <asm/system.h> | |
1da177e4 LT |
35 | #include <asm/delay.h> |
36 | #include <asm/uaccess.h> | |
296167ae | 37 | #include <asm/udbg.h> |
a7f31841 | 38 | #include <asm/syscalls.h> |
8f5c7579 NL |
39 | #include <asm/smp.h> |
40 | #include <asm/atomic.h> | |
c4007a2f | 41 | #include <asm/time.h> |
46db2f86 | 42 | #include <asm/mmu.h> |
1da177e4 | 43 | |
033ef338 | 44 | struct rtas_t rtas = { |
f97bb36f | 45 | .lock = __RAW_SPIN_LOCK_UNLOCKED |
1da177e4 | 46 | }; |
ab3ab74d | 47 | EXPORT_SYMBOL(rtas); |
1da177e4 | 48 | |
91dc182c | 49 | struct rtas_suspend_me_data { |
8f5c7579 | 50 | atomic_t working; /* number of cpus accessing this struct */ |
f52862f4 | 51 | atomic_t done; |
8f5c7579 NL |
52 | int token; /* ibm,suspend-me */ |
53 | int error; | |
54 | struct completion *complete; /* wait on this until working == 0 */ | |
91dc182c DB |
55 | }; |
56 | ||
1da177e4 | 57 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
58 | EXPORT_SYMBOL(rtas_data_buf_lock); |
59 | ||
033ef338 | 60 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
61 | EXPORT_SYMBOL(rtas_data_buf); |
62 | ||
1da177e4 LT |
63 | unsigned long rtas_rmo_buf; |
64 | ||
f4fcbbe9 PM |
65 | /* |
66 | * If non-NULL, this gets called when the kernel terminates. | |
67 | * This is done like this so rtas_flash can be a module. | |
68 | */ | |
69 | void (*rtas_flash_term_hook)(int); | |
70 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
71 | ||
f97bb36f BH |
72 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
73 | * because those can be called from within really nasty contexts | |
74 | * such as having the timebase stopped which would lockup with | |
75 | * normal locks and spinlock debugging enabled | |
76 | */ | |
77 | static unsigned long lock_rtas(void) | |
78 | { | |
79 | unsigned long flags; | |
80 | ||
81 | local_irq_save(flags); | |
82 | preempt_disable(); | |
83 | __raw_spin_lock_flags(&rtas.lock, flags); | |
84 | return flags; | |
85 | } | |
86 | ||
87 | static void unlock_rtas(unsigned long flags) | |
88 | { | |
89 | __raw_spin_unlock(&rtas.lock); | |
90 | local_irq_restore(flags); | |
91 | preempt_enable(); | |
92 | } | |
93 | ||
033ef338 PM |
94 | /* |
95 | * call_rtas_display_status and call_rtas_display_status_delay | |
96 | * are designed only for very early low-level debugging, which | |
97 | * is why the token is hard-coded to 10. | |
98 | */ | |
296167ae | 99 | static void call_rtas_display_status(char c) |
1da177e4 LT |
100 | { |
101 | struct rtas_args *args = &rtas.args; | |
102 | unsigned long s; | |
103 | ||
104 | if (!rtas.base) | |
105 | return; | |
f97bb36f | 106 | s = lock_rtas(); |
1da177e4 LT |
107 | |
108 | args->token = 10; | |
109 | args->nargs = 1; | |
110 | args->nret = 1; | |
111 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 112 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
113 | |
114 | enter_rtas(__pa(args)); | |
115 | ||
f97bb36f | 116 | unlock_rtas(s); |
1da177e4 LT |
117 | } |
118 | ||
296167ae | 119 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
120 | { |
121 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
122 | static int width = 16; | |
123 | ||
124 | if (c == '\n') { | |
125 | while (width-- > 0) | |
126 | call_rtas_display_status(' '); | |
127 | width = 16; | |
21fe3301 | 128 | mdelay(500); |
1da177e4 LT |
129 | pending_newline = 1; |
130 | } else { | |
131 | if (pending_newline) { | |
132 | call_rtas_display_status('\r'); | |
133 | call_rtas_display_status('\n'); | |
134 | } | |
135 | pending_newline = 0; | |
136 | if (width--) { | |
137 | call_rtas_display_status(c); | |
138 | udelay(10000); | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
cc46bb98 | 143 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
144 | { |
145 | udbg_putc = call_rtas_display_status_delay; | |
146 | } | |
147 | ||
cc46bb98 ME |
148 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
149 | ||
150 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
151 | * work, you can hard code the token values for your firmware here and | |
152 | * hardcode rtas.base/entry etc. | |
153 | */ | |
154 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
155 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
156 | ||
157 | static void udbg_rtascon_putc(char c) | |
158 | { | |
159 | int tries; | |
160 | ||
161 | if (!rtas.base) | |
162 | return; | |
163 | ||
164 | /* Add CRs before LFs */ | |
165 | if (c == '\n') | |
166 | udbg_rtascon_putc('\r'); | |
167 | ||
168 | /* if there is more than one character to be displayed, wait a bit */ | |
169 | for (tries = 0; tries < 16; tries++) { | |
170 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
171 | break; | |
172 | udelay(1000); | |
173 | } | |
174 | } | |
175 | ||
176 | static int udbg_rtascon_getc_poll(void) | |
177 | { | |
178 | int c; | |
179 | ||
180 | if (!rtas.base) | |
181 | return -1; | |
182 | ||
183 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
184 | return -1; | |
185 | ||
186 | return c; | |
187 | } | |
188 | ||
189 | static int udbg_rtascon_getc(void) | |
190 | { | |
191 | int c; | |
192 | ||
193 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
194 | ; | |
195 | ||
196 | return c; | |
197 | } | |
198 | ||
199 | ||
200 | void __init udbg_init_rtas_console(void) | |
201 | { | |
202 | udbg_putc = udbg_rtascon_putc; | |
203 | udbg_getc = udbg_rtascon_getc; | |
204 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
205 | } | |
206 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
207 | ||
033ef338 | 208 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
209 | { |
210 | struct device_node *root; | |
a7f67bdf JK |
211 | int width; |
212 | const int *p; | |
6566c6f1 AB |
213 | char *os; |
214 | static int display_character, set_indicator; | |
a7f67bdf | 215 | static int display_width, display_lines, form_feed; |
c5a69d57 | 216 | static const int *row_width; |
6566c6f1 | 217 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 218 | static int current_line; |
6566c6f1 AB |
219 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
220 | ||
221 | if (!rtas.base) | |
222 | return; | |
223 | ||
8f586b22 MS |
224 | if (display_width == 0) { |
225 | display_width = 0x10; | |
8c8dc322 | 226 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 227 | if ((p = of_get_property(root, |
8f586b22 MS |
228 | "ibm,display-line-length", NULL))) |
229 | display_width = *p; | |
e2eb6392 | 230 | if ((p = of_get_property(root, |
8f586b22 MS |
231 | "ibm,form-feed", NULL))) |
232 | form_feed = *p; | |
e2eb6392 | 233 | if ((p = of_get_property(root, |
8f586b22 MS |
234 | "ibm,display-number-of-lines", NULL))) |
235 | display_lines = *p; | |
e2eb6392 | 236 | row_width = of_get_property(root, |
8f586b22 | 237 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 238 | of_node_put(root); |
8f586b22 | 239 | } |
6566c6f1 AB |
240 | display_character = rtas_token("display-character"); |
241 | set_indicator = rtas_token("set-indicator"); | |
242 | } | |
243 | ||
244 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
245 | /* use hex display if available */ | |
246 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
247 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
248 | return; | |
249 | } | |
250 | ||
251 | spin_lock(&progress_lock); | |
252 | ||
253 | /* | |
254 | * Last write ended with newline, but we didn't print it since | |
255 | * it would just clear the bottom line of output. Print it now | |
256 | * instead. | |
257 | * | |
8f586b22 MS |
258 | * If no newline is pending and form feed is supported, clear the |
259 | * display with a form feed; otherwise, print a CR to start output | |
260 | * at the beginning of the line. | |
6566c6f1 AB |
261 | */ |
262 | if (pending_newline) { | |
263 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
264 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
265 | pending_newline = 0; | |
266 | } else { | |
8f586b22 MS |
267 | current_line = 0; |
268 | if (form_feed) | |
269 | rtas_call(display_character, 1, 1, NULL, | |
270 | (char)form_feed); | |
271 | else | |
272 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
273 | } |
274 | ||
8f586b22 MS |
275 | if (row_width) |
276 | width = row_width[current_line]; | |
277 | else | |
278 | width = display_width; | |
6566c6f1 AB |
279 | os = s; |
280 | while (*os) { | |
281 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
282 | /* If newline is the last character, save it |
283 | * until next call to avoid bumping up the | |
284 | * display output. | |
285 | */ | |
286 | if (*os == '\n' && !os[1]) { | |
287 | pending_newline = 1; | |
8f586b22 MS |
288 | current_line++; |
289 | if (current_line > display_lines-1) | |
290 | current_line = display_lines-1; | |
6566c6f1 AB |
291 | spin_unlock(&progress_lock); |
292 | return; | |
293 | } | |
294 | ||
295 | /* RTAS wants CR-LF, not just LF */ | |
296 | ||
297 | if (*os == '\n') { | |
298 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
299 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
300 | } else { | |
301 | /* CR might be used to re-draw a line, so we'll | |
302 | * leave it alone and not add LF. | |
303 | */ | |
304 | rtas_call(display_character, 1, 1, NULL, *os); | |
305 | } | |
306 | ||
8f586b22 MS |
307 | if (row_width) |
308 | width = row_width[current_line]; | |
309 | else | |
310 | width = display_width; | |
6566c6f1 AB |
311 | } else { |
312 | width--; | |
313 | rtas_call(display_character, 1, 1, NULL, *os); | |
314 | } | |
315 | ||
316 | os++; | |
317 | ||
318 | /* if we overwrite the screen length */ | |
319 | if (width <= 0) | |
320 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
321 | os++; | |
322 | } | |
323 | ||
6566c6f1 AB |
324 | spin_unlock(&progress_lock); |
325 | } | |
f4fcbbe9 | 326 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 327 | |
033ef338 | 328 | int rtas_token(const char *service) |
1da177e4 | 329 | { |
a7f67bdf | 330 | const int *tokp; |
033ef338 | 331 | if (rtas.dev == NULL) |
1da177e4 | 332 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 333 | tokp = of_get_property(rtas.dev, service, NULL); |
1da177e4 LT |
334 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
335 | } | |
ab3ab74d | 336 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 337 | |
f2d6d2d8 NL |
338 | int rtas_service_present(const char *service) |
339 | { | |
340 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
341 | } | |
342 | EXPORT_SYMBOL(rtas_service_present); | |
343 | ||
033ef338 | 344 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
345 | /* |
346 | * Return the firmware-specified size of the error log buffer | |
347 | * for all rtas calls that require an error buffer argument. | |
348 | * This includes 'check-exception' and 'rtas-last-error'. | |
349 | */ | |
350 | int rtas_get_error_log_max(void) | |
351 | { | |
352 | static int rtas_error_log_max; | |
353 | if (rtas_error_log_max) | |
354 | return rtas_error_log_max; | |
355 | ||
356 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
357 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
358 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
359 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
360 | rtas_error_log_max); | |
1da177e4 LT |
361 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
362 | } | |
363 | return rtas_error_log_max; | |
364 | } | |
033ef338 | 365 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
366 | |
367 | ||
1c21a293 ME |
368 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
369 | static int rtas_last_error_token; | |
033ef338 | 370 | |
1da177e4 LT |
371 | /** Return a copy of the detailed error text associated with the |
372 | * most recent failed call to rtas. Because the error text | |
373 | * might go stale if there are any other intervening rtas calls, | |
374 | * this routine must be called atomically with whatever produced | |
375 | * the error (i.e. with rtas.lock still held from the previous call). | |
376 | */ | |
033ef338 | 377 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
378 | { |
379 | struct rtas_args err_args, save_args; | |
380 | u32 bufsz; | |
033ef338 PM |
381 | char *buf = NULL; |
382 | ||
383 | if (rtas_last_error_token == -1) | |
384 | return NULL; | |
1da177e4 LT |
385 | |
386 | bufsz = rtas_get_error_log_max(); | |
387 | ||
033ef338 | 388 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
389 | err_args.nargs = 2; |
390 | err_args.nret = 1; | |
1da177e4 LT |
391 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
392 | err_args.args[1] = bufsz; | |
393 | err_args.args[2] = 0; | |
394 | ||
395 | save_args = rtas.args; | |
396 | rtas.args = err_args; | |
397 | ||
398 | enter_rtas(__pa(&rtas.args)); | |
399 | ||
400 | err_args = rtas.args; | |
401 | rtas.args = save_args; | |
402 | ||
033ef338 PM |
403 | /* Log the error in the unlikely case that there was one. */ |
404 | if (unlikely(err_args.args[2] == 0)) { | |
405 | if (altbuf) { | |
406 | buf = altbuf; | |
407 | } else { | |
408 | buf = rtas_err_buf; | |
409 | if (mem_init_done) | |
410 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
411 | } | |
412 | if (buf) | |
413 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
414 | } | |
415 | ||
416 | return buf; | |
1da177e4 LT |
417 | } |
418 | ||
033ef338 PM |
419 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
420 | ||
421 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
422 | #define __fetch_rtas_last_error(x) NULL | |
423 | #define get_errorlog_buffer() NULL | |
424 | #endif | |
425 | ||
1da177e4 LT |
426 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
427 | { | |
428 | va_list list; | |
033ef338 | 429 | int i; |
1da177e4 LT |
430 | unsigned long s; |
431 | struct rtas_args *rtas_args; | |
033ef338 | 432 | char *buff_copy = NULL; |
1da177e4 LT |
433 | int ret; |
434 | ||
24da3dd5 | 435 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
436 | return -1; |
437 | ||
f97bb36f | 438 | s = lock_rtas(); |
1da177e4 LT |
439 | rtas_args = &rtas.args; |
440 | ||
441 | rtas_args->token = token; | |
442 | rtas_args->nargs = nargs; | |
443 | rtas_args->nret = nret; | |
444 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
445 | va_start(list, outputs); | |
033ef338 | 446 | for (i = 0; i < nargs; ++i) |
1da177e4 | 447 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
448 | va_end(list); |
449 | ||
450 | for (i = 0; i < nret; ++i) | |
451 | rtas_args->rets[i] = 0; | |
452 | ||
1da177e4 | 453 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
454 | |
455 | /* A -1 return code indicates that the last command couldn't | |
456 | be completed due to a hardware error. */ | |
457 | if (rtas_args->rets[0] == -1) | |
033ef338 | 458 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
459 | |
460 | if (nret > 1 && outputs != NULL) | |
461 | for (i = 0; i < nret-1; ++i) | |
462 | outputs[i] = rtas_args->rets[i+1]; | |
463 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
464 | ||
f97bb36f | 465 | unlock_rtas(s); |
1da177e4 LT |
466 | |
467 | if (buff_copy) { | |
468 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
469 | if (mem_init_done) | |
470 | kfree(buff_copy); | |
471 | } | |
472 | return ret; | |
473 | } | |
ab3ab74d | 474 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 475 | |
507279db JR |
476 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
477 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 478 | */ |
507279db | 479 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 480 | { |
507279db JR |
481 | int order; |
482 | unsigned int ms = 0; | |
483 | ||
484 | if (status == RTAS_BUSY) { | |
485 | ms = 1; | |
486 | } else if (status >= 9900 && status <= 9905) { | |
487 | order = status - 9900; | |
488 | for (ms = 1; order > 0; order--) | |
489 | ms *= 10; | |
490 | } | |
1da177e4 | 491 | |
507279db JR |
492 | return ms; |
493 | } | |
ab3ab74d | 494 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 495 | |
507279db JR |
496 | /* For an RTAS busy status code, perform the hinted delay. */ |
497 | unsigned int rtas_busy_delay(int status) | |
498 | { | |
499 | unsigned int ms; | |
1da177e4 | 500 | |
507279db JR |
501 | might_sleep(); |
502 | ms = rtas_busy_delay_time(status); | |
503 | if (ms) | |
504 | msleep(ms); | |
505 | ||
506 | return ms; | |
1da177e4 | 507 | } |
ab3ab74d | 508 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 509 | |
1c21a293 | 510 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
511 | { |
512 | int rc; | |
513 | ||
514 | switch (rtas_rc) { | |
515 | case -1: /* Hardware Error */ | |
516 | rc = -EIO; | |
517 | break; | |
518 | case -3: /* Bad indicator/domain/etc */ | |
519 | rc = -EINVAL; | |
520 | break; | |
521 | case -9000: /* Isolation error */ | |
522 | rc = -EFAULT; | |
523 | break; | |
524 | case -9001: /* Outstanding TCE/PTE */ | |
525 | rc = -EEXIST; | |
526 | break; | |
527 | case -9002: /* No usable slot */ | |
528 | rc = -ENODEV; | |
529 | break; | |
530 | default: | |
531 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 532 | __func__, rtas_rc); |
1da177e4 LT |
533 | rc = -ERANGE; |
534 | break; | |
535 | } | |
536 | return rc; | |
537 | } | |
538 | ||
539 | int rtas_get_power_level(int powerdomain, int *level) | |
540 | { | |
541 | int token = rtas_token("get-power-level"); | |
542 | int rc; | |
543 | ||
544 | if (token == RTAS_UNKNOWN_SERVICE) | |
545 | return -ENOENT; | |
546 | ||
547 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
548 | udelay(1); | |
549 | ||
550 | if (rc < 0) | |
551 | return rtas_error_rc(rc); | |
552 | return rc; | |
553 | } | |
ab3ab74d | 554 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
555 | |
556 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
557 | { | |
558 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
559 | int rc; |
560 | ||
561 | if (token == RTAS_UNKNOWN_SERVICE) | |
562 | return -ENOENT; | |
563 | ||
507279db | 564 | do { |
1da177e4 | 565 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 566 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
567 | |
568 | if (rc < 0) | |
569 | return rtas_error_rc(rc); | |
570 | return rc; | |
571 | } | |
ab3ab74d | 572 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
573 | |
574 | int rtas_get_sensor(int sensor, int index, int *state) | |
575 | { | |
576 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
577 | int rc; |
578 | ||
579 | if (token == RTAS_UNKNOWN_SERVICE) | |
580 | return -ENOENT; | |
581 | ||
507279db | 582 | do { |
1da177e4 | 583 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 584 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
585 | |
586 | if (rc < 0) | |
587 | return rtas_error_rc(rc); | |
588 | return rc; | |
589 | } | |
ab3ab74d | 590 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 591 | |
edc72ac4 NL |
592 | bool rtas_indicator_present(int token, int *maxindex) |
593 | { | |
594 | int proplen, count, i; | |
595 | const struct indicator_elem { | |
596 | u32 token; | |
597 | u32 maxindex; | |
598 | } *indicators; | |
599 | ||
600 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
601 | if (!indicators) | |
602 | return false; | |
603 | ||
604 | count = proplen / sizeof(struct indicator_elem); | |
605 | ||
606 | for (i = 0; i < count; i++) { | |
607 | if (indicators[i].token != token) | |
608 | continue; | |
609 | if (maxindex) | |
610 | *maxindex = indicators[i].maxindex; | |
611 | return true; | |
612 | } | |
613 | ||
614 | return false; | |
615 | } | |
616 | EXPORT_SYMBOL(rtas_indicator_present); | |
617 | ||
1da177e4 LT |
618 | int rtas_set_indicator(int indicator, int index, int new_value) |
619 | { | |
620 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
621 | int rc; |
622 | ||
623 | if (token == RTAS_UNKNOWN_SERVICE) | |
624 | return -ENOENT; | |
625 | ||
507279db | 626 | do { |
1da177e4 | 627 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 628 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
629 | |
630 | if (rc < 0) | |
631 | return rtas_error_rc(rc); | |
632 | return rc; | |
633 | } | |
ab3ab74d | 634 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 635 | |
81b73dd9 HM |
636 | /* |
637 | * Ignoring RTAS extended delay | |
638 | */ | |
639 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
640 | { | |
641 | int rc; | |
642 | int token = rtas_token("set-indicator"); | |
643 | ||
644 | if (token == RTAS_UNKNOWN_SERVICE) | |
645 | return -ENOENT; | |
646 | ||
647 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
648 | ||
649 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
650 | ||
651 | if (rc < 0) | |
652 | return rtas_error_rc(rc); | |
653 | ||
654 | return rc; | |
655 | } | |
656 | ||
033ef338 | 657 | void rtas_restart(char *cmd) |
1da177e4 | 658 | { |
f4fcbbe9 PM |
659 | if (rtas_flash_term_hook) |
660 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
661 | printk("RTAS system-reboot returned %d\n", |
662 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
663 | for (;;); | |
664 | } | |
665 | ||
033ef338 | 666 | void rtas_power_off(void) |
1da177e4 | 667 | { |
f4fcbbe9 PM |
668 | if (rtas_flash_term_hook) |
669 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
670 | /* allow power on only with power button press */ |
671 | printk("RTAS power-off returned %d\n", | |
672 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
673 | for (;;); | |
674 | } | |
675 | ||
033ef338 | 676 | void rtas_halt(void) |
1da177e4 | 677 | { |
f4fcbbe9 PM |
678 | if (rtas_flash_term_hook) |
679 | rtas_flash_term_hook(SYS_HALT); | |
680 | /* allow power on only with power button press */ | |
681 | printk("RTAS power-off returned %d\n", | |
682 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
683 | for (;;); | |
1da177e4 LT |
684 | } |
685 | ||
686 | /* Must be in the RMO region, so we place it here */ | |
687 | static char rtas_os_term_buf[2048]; | |
688 | ||
8f515061 | 689 | void rtas_os_term(char *str) |
a2b51812 LV |
690 | { |
691 | int status; | |
39ed2fe6 | 692 | |
8f515061 PM |
693 | if (panic_timeout) |
694 | return; | |
695 | ||
1da177e4 LT |
696 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) |
697 | return; | |
698 | ||
8f515061 PM |
699 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
700 | ||
1da177e4 LT |
701 | do { |
702 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
703 | __pa(rtas_os_term_buf)); | |
507279db | 704 | } while (rtas_busy_delay(status)); |
1da177e4 | 705 | |
507279db JR |
706 | if (status != 0) |
707 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
1da177e4 | 708 | status); |
1da177e4 LT |
709 | } |
710 | ||
91dc182c DB |
711 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
712 | #ifdef CONFIG_PPC_PSERIES | |
713 | static void rtas_percpu_suspend_me(void *info) | |
714 | { | |
f52862f4 | 715 | long rc = H_SUCCESS; |
8f5c7579 | 716 | unsigned long msr_save; |
46db2f86 | 717 | u16 slb_size = mmu_slb_size; |
8f5c7579 | 718 | int cpu; |
91dc182c DB |
719 | struct rtas_suspend_me_data *data = |
720 | (struct rtas_suspend_me_data *)info; | |
721 | ||
8f5c7579 NL |
722 | atomic_inc(&data->working); |
723 | ||
724 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
725 | msr_save = mfmsr(); | |
726 | mtmsr(msr_save & ~(MSR_EE)); | |
727 | ||
f52862f4 BK |
728 | while (rc == H_SUCCESS && !atomic_read(&data->done)) |
729 | rc = plpar_hcall_norets(H_JOIN); | |
8f5c7579 NL |
730 | |
731 | mtmsr(msr_save); | |
91dc182c | 732 | |
8f5c7579 NL |
733 | if (rc == H_SUCCESS) { |
734 | /* This cpu was prodded and the suspend is complete. */ | |
735 | goto out; | |
736 | } else if (rc == H_CONTINUE) { | |
737 | /* All other cpus are in H_JOIN, this cpu does | |
738 | * the suspend. | |
739 | */ | |
46db2f86 | 740 | slb_set_size(SLB_MIN_SIZE); |
8f5c7579 NL |
741 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", |
742 | smp_processor_id()); | |
743 | data->error = rtas_call(data->token, 0, 1, NULL); | |
744 | ||
46db2f86 | 745 | if (data->error) { |
8f5c7579 NL |
746 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", |
747 | data->error); | |
46db2f86 BK |
748 | slb_set_size(slb_size); |
749 | } | |
91dc182c | 750 | } else { |
8f5c7579 NL |
751 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
752 | smp_processor_id(), rc); | |
753 | data->error = rc; | |
91dc182c | 754 | } |
f52862f4 BK |
755 | |
756 | atomic_set(&data->done, 1); | |
757 | ||
8f5c7579 NL |
758 | /* This cpu did the suspend or got an error; in either case, |
759 | * we need to prod all other other cpus out of join state. | |
760 | * Extra prods are harmless. | |
761 | */ | |
762 | for_each_online_cpu(cpu) | |
763 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
91dc182c | 764 | out: |
8f5c7579 NL |
765 | if (atomic_dec_return(&data->working) == 0) |
766 | complete(data->complete); | |
91dc182c DB |
767 | } |
768 | ||
769 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
770 | { | |
368a6ba5 DB |
771 | long state; |
772 | long rc; | |
b9377ffc | 773 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 774 | struct rtas_suspend_me_data data; |
8f5c7579 NL |
775 | DECLARE_COMPLETION_ONSTACK(done); |
776 | ||
777 | if (!rtas_service_present("ibm,suspend-me")) | |
778 | return -ENOSYS; | |
91dc182c | 779 | |
368a6ba5 | 780 | /* Make sure the state is valid */ |
b9377ffc AB |
781 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
782 | ((u64)args->args[0] << 32) | args->args[1]); | |
783 | ||
784 | state = retbuf[0]; | |
368a6ba5 DB |
785 | |
786 | if (rc) { | |
787 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
788 | return rc; | |
789 | } else if (state == H_VASI_ENABLED) { | |
790 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
791 | return 0; | |
792 | } else if (state != H_VASI_SUSPENDING) { | |
793 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
794 | state); | |
795 | args->args[args->nargs] = -1; | |
796 | return 0; | |
797 | } | |
798 | ||
8f5c7579 | 799 | atomic_set(&data.working, 0); |
f52862f4 | 800 | atomic_set(&data.done, 0); |
8f5c7579 NL |
801 | data.token = rtas_token("ibm,suspend-me"); |
802 | data.error = 0; | |
803 | data.complete = &done; | |
91dc182c DB |
804 | |
805 | /* Call function on all CPUs. One of us will make the | |
806 | * rtas call | |
807 | */ | |
15c8b6c1 | 808 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8f5c7579 | 809 | data.error = -EINVAL; |
91dc182c | 810 | |
8f5c7579 | 811 | wait_for_completion(&done); |
91dc182c | 812 | |
8f5c7579 NL |
813 | if (data.error != 0) |
814 | printk(KERN_ERR "Error doing global join\n"); | |
91dc182c | 815 | |
8f5c7579 | 816 | return data.error; |
91dc182c DB |
817 | } |
818 | #else /* CONFIG_PPC_PSERIES */ | |
819 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
820 | { | |
821 | return -ENOSYS; | |
822 | } | |
823 | #endif | |
1da177e4 LT |
824 | |
825 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
826 | { | |
827 | struct rtas_args args; | |
828 | unsigned long flags; | |
033ef338 | 829 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 830 | int nargs; |
91dc182c | 831 | int rc; |
1da177e4 LT |
832 | |
833 | if (!capable(CAP_SYS_ADMIN)) | |
834 | return -EPERM; | |
835 | ||
836 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
837 | return -EFAULT; | |
838 | ||
839 | nargs = args.nargs; | |
840 | if (nargs > ARRAY_SIZE(args.args) | |
841 | || args.nret > ARRAY_SIZE(args.args) | |
842 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
843 | return -EINVAL; | |
844 | ||
845 | /* Copy in args. */ | |
846 | if (copy_from_user(args.args, uargs->args, | |
847 | nargs * sizeof(rtas_arg_t)) != 0) | |
848 | return -EFAULT; | |
849 | ||
91dc182c DB |
850 | if (args.token == RTAS_UNKNOWN_SERVICE) |
851 | return -EINVAL; | |
852 | ||
b79998fc NF |
853 | args.rets = &args.args[nargs]; |
854 | memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); | |
855 | ||
91dc182c DB |
856 | /* Need to handle ibm,suspend_me call specially */ |
857 | if (args.token == ibm_suspend_me_token) { | |
858 | rc = rtas_ibm_suspend_me(&args); | |
859 | if (rc) | |
860 | return rc; | |
861 | goto copy_return; | |
862 | } | |
863 | ||
033ef338 | 864 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 865 | |
f97bb36f | 866 | flags = lock_rtas(); |
1da177e4 LT |
867 | |
868 | rtas.args = args; | |
869 | enter_rtas(__pa(&rtas.args)); | |
870 | args = rtas.args; | |
871 | ||
1da177e4 LT |
872 | /* A -1 return code indicates that the last command couldn't |
873 | be completed due to a hardware error. */ | |
033ef338 PM |
874 | if (args.rets[0] == -1) |
875 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 | 876 | |
f97bb36f | 877 | unlock_rtas(flags); |
1da177e4 LT |
878 | |
879 | if (buff_copy) { | |
033ef338 PM |
880 | if (errbuf) |
881 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
882 | kfree(buff_copy); |
883 | } | |
884 | ||
91dc182c | 885 | copy_return: |
1da177e4 LT |
886 | /* Copy out args. */ |
887 | if (copy_to_user(uargs->args + nargs, | |
888 | args.args + nargs, | |
889 | args.nret * sizeof(rtas_arg_t)) != 0) | |
890 | return -EFAULT; | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
1da177e4 | 895 | /* |
943ffb58 | 896 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
897 | * informations from the device-tree and allocate the RMO buffer for userland |
898 | * accesses. | |
899 | */ | |
900 | void __init rtas_initialize(void) | |
901 | { | |
033ef338 PM |
902 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
903 | ||
1da177e4 LT |
904 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
905 | * about it. | |
906 | */ | |
907 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
908 | if (rtas.dev) { | |
a7f67bdf | 909 | const u32 *basep, *entryp, *sizep; |
1da177e4 | 910 | |
e2eb6392 SR |
911 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
912 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 LT |
913 | if (basep != NULL && sizep != NULL) { |
914 | rtas.base = *basep; | |
915 | rtas.size = *sizep; | |
e2eb6392 | 916 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 917 | "linux,rtas-entry", NULL); |
1da177e4 LT |
918 | if (entryp == NULL) /* Ugh */ |
919 | rtas.entry = rtas.base; | |
920 | else | |
921 | rtas.entry = *entryp; | |
922 | } else | |
923 | rtas.dev = NULL; | |
924 | } | |
033ef338 PM |
925 | if (!rtas.dev) |
926 | return; | |
927 | ||
1da177e4 LT |
928 | /* If RTAS was found, allocate the RMO buffer for it and look for |
929 | * the stop-self token if any | |
930 | */ | |
033ef338 | 931 | #ifdef CONFIG_PPC64 |
e8222502 | 932 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
033ef338 | 933 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
934 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
935 | } | |
033ef338 PM |
936 | #endif |
937 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 | 938 | |
033ef338 PM |
939 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
940 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
941 | #endif | |
1da177e4 | 942 | } |
458148c0 ME |
943 | |
944 | int __init early_init_dt_scan_rtas(unsigned long node, | |
945 | const char *uname, int depth, void *data) | |
946 | { | |
947 | u32 *basep, *entryp, *sizep; | |
948 | ||
949 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
950 | return 0; | |
951 | ||
952 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
953 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
954 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
955 | ||
956 | if (basep && entryp && sizep) { | |
957 | rtas.base = *basep; | |
958 | rtas.entry = *entryp; | |
959 | rtas.size = *sizep; | |
960 | } | |
961 | ||
cc46bb98 ME |
962 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
963 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
964 | if (basep) | |
965 | rtas_putchar_token = *basep; | |
966 | ||
967 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
968 | if (basep) | |
969 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
970 | |
971 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
972 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
973 | udbg_init_rtas_console(); | |
974 | ||
cc46bb98 ME |
975 | #endif |
976 | ||
458148c0 ME |
977 | /* break now */ |
978 | return 1; | |
979 | } | |
c4007a2f | 980 | |
445c8951 | 981 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
982 | static u64 timebase = 0; |
983 | ||
984 | void __cpuinit rtas_give_timebase(void) | |
985 | { | |
986 | unsigned long flags; | |
987 | ||
988 | local_irq_save(flags); | |
989 | hard_irq_disable(); | |
990 | __raw_spin_lock(&timebase_lock); | |
991 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); | |
992 | timebase = get_tb(); | |
993 | __raw_spin_unlock(&timebase_lock); | |
994 | ||
995 | while (timebase) | |
996 | barrier(); | |
997 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
998 | local_irq_restore(flags); | |
999 | } | |
1000 | ||
1001 | void __cpuinit rtas_take_timebase(void) | |
1002 | { | |
1003 | while (!timebase) | |
1004 | barrier(); | |
1005 | __raw_spin_lock(&timebase_lock); | |
1006 | set_tb(timebase >> 32, timebase & 0xffffffff); | |
1007 | timebase = 0; | |
1008 | __raw_spin_unlock(&timebase_lock); | |
1009 | } |